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Preparation method for plant oil-based polyurethane coated fertilizer having improved water resistance

A vegetable oil-based, polyurethane technology, applied in the field of polyurethane-coated fertilizer preparation, achieves the effects of reduced dissolution rate, obvious effect, and slowed down hydrolysis rate

Active Publication Date: 2015-12-02
中国-阿拉伯化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since the anti-hydrolysis agent can react with the carboxyl group produced by the continuous hydrolysis of polyester polyurethane to eliminate the carboxyl group, how to introduce this type of anti-hydrolysis agent into the vegetable oil-based polyurethane-coated slow-release urea to eliminate the carboxyl group in the vegetable oil polyol? The carboxyl group in the belt, thereby improving the structure of the coating layer and improving the slow-release effect, has become a technical problem that needs to be solved urgently in this technical field; there are no reports at home and abroad that anti-hydrolysis agents are applied to slow-release fertilizers, especially for the elimination of vegetable oils. The carboxyl group contained in the polyol can improve the structure of the coating layer and improve the sustained release effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of castor oil-based polyurethane coated fertilizer with improved water blocking performance, comprising the steps of:

[0038] 1. Modification process of castor oil polyol:

[0039] Add 0.3% by weight of commercially available polycarbodiimide anti-hydrolysis agent to commercially available castor oil polyol (its acid value mgKOH / g is ≤ 2.3, castor oil polyol accounts for membrane material ratio / % is 65%), Stir well at 90°C for 2 hours to fully react the polycarbodiimide with the carboxyl group, then measure the acid value of the modified castor oil, and the mgKOH / g is ≤1.5.

[0040]2. Slow-release urea preparation process: Weigh commercially available 2.00-4.75mm large granular urea, heat it up to 78-80°C, keep warm, fully mix the modified castor oil polyol with commercially available lubricant, and then mix with commercially available The isocyanate is quickly mixed, and then evenly coated on the surface of the urea granules by a small amount of ...

Embodiment 2

[0043] A preparation method of castor oil-based polyurethane coated fertilizer with improved water blocking performance, comprising the steps of:

[0044] 1. Modification process of castor oil polyol:

[0045] Add 0.6% by weight of commercially available polycarbodiimide anti-hydrolysis agent to commercially available castor oil polyol (its acid value mgKOH / g is ≤ 2.3, castor oil polyol accounts for membrane material ratio / % is 65%), Stir well at 90°C for 2 hours to fully react the polycarbodiimide with the carboxyl group, then measure the acid value of the modified castor oil, and the mgKOH / g is ≤1.0.

[0046] 2. Slow-release urea preparation process: Weigh 2.00-4.75mm large-grain urea, heat it up to 78-80°C, keep warm, fully mix the modified castor oil polyol with commercially available lubricants, and then mix with commercially available The isocyanate is quickly mixed, and then evenly coated on the surface of the urea granules by a small amount of multiple coating methods...

Embodiment 3

[0049] A preparation method of castor oil-based polyurethane coated fertilizer with improved water blocking performance, comprising the steps of:

[0050] 1. Modification process of castor oil polyol:

[0051] 2.0% by weight of commercially available polycarbodiimide anti-hydrolysis agent is added to commercially available castor oil polyol (its acid value mgKOH / g is ≤ 2.3, castor oil polyol accounts for membrane material ratio / % is 65%), Stir well at 90°C for 2 hours to fully react the polycarbodiimide with the carboxyl group, then measure the acid value of the modified castor oil, and the mgKOH / g is ≤0.4.

[0052] 2. Preparation process of slow-release urea: Weigh 2.00-4.75mm large-grain urea, heat it up to 78-80°C, keep warm, fully mix the modified castor oil polyol with commercially available lubricant, and then mix with commercially available isocyanate Rapid mixing, and then, through a small amount of coating method, evenly coated on the surface of the urea particles, t...

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Abstract

The invention discloses a preparation method for plant oil-based polyurethane coated fertilizer having improved water resistance. The preparation method comprises the following steps that step 1, modification treatment is performed on plant oil polyalcohol, wherein by weight, 0.2%-5% of hydrolysis stabilizer is added into the plant oil polyalcohol and stirred at high temperature, so that modified plant oil polyalcohol is obtained; step 2, The polyurethane coated urea slow-release fertilizer is prepared, wherein large-particle urea is taken by weighing, the temperature is raised to 78-80 DEG C and is maintained, the modified plant oil polyalcohol prepared in the step 1 and lubricant are fully mixed and fused through a coating method, afterwards, the mixture and liquid isocyanate resin are quickly mixed, the surfaces of urea particles are evenly coated with the mixture, the urea particles and the coating liquid are fully mixed in a revolving drum, the coating liquid is gradually subjected to crosslinking solidification, and finally the polyurethane coated urea slow-release fertilizer is formed. Water resistance testing is performed on the prepared plant oil-based polyurethane coated urea, and a good result is obtained.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane-coated fertilizer, in particular to a preparation method of a vegetable oil-based polyurethane-coated fertilizer with improved water resistance. Background technique [0002] Polyurethane is an important multi-purpose polymer synthetic material, widely used in petrochemical, machinery manufacturing, aviation, medical, agricultural and other fields. The main raw materials for synthesizing polyurethane are polyols and isocyanates, both of which are petrochemical products. [0003] With the increasingly tight supply of global petrochemical resources, environmentally friendly and ecological raw materials have become a research hotspot in the chemical industry. Because of its wide application range, stable biodegradability, low price, and renewable advantages, vegetable oil is gradually replacing petrochemical products as an important bio-based raw material in the polyurethane synthesis indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C05G3/08C05C9/00C05G3/90
CPCC05C9/00C05G3/90C05G5/37C08G18/36
Inventor 吴舒茹铁军王金铭郑秀兴贲艳英刘洪涛肖占梅何栋佟艳娟
Owner 中国-阿拉伯化肥有限公司
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